<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    let user = prompt('请输入用户名')
    let pass = +prompt('请输入密码')
    user === 'admin' && pass === 123 ? alert('成功') : alert('失败')
    
  </script>
</body>
</html>